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# Math Prob. Unit

### The Probability Unit Test study guide

Question | Answer |
---|---|

What is a set? | Any group of things or numbers that are selected according to a well defined rule. |

What is an element? | Part of a set; a number in a set. |

What is the universal set? | The set containing elements under consideration for a particular problem. |

What is a subset? | A set that forms part of another set. |

What is the intersection of two sets? | The set of elements that belong to two or more sets. |

What is the union? | The set formed when you combine two or more sets. |

What is the complement? | The set of all elements within a particular universal set that is not part of the given set. |

What is theoretical probability? | The number of all ways that an event can happen over the total number of events. |

What is the experimental probability? | The ratio of favorable outcomes that did happen over the number of trials. |

What are the notations for Universal set, subset, intersection, and union? | Universal: U; Union: ∪; Intersection: ∩; Subset: ⊂ |

What is random sampling? | Sampling in which everyone has an equal chance of being selected. |

What is Convenience sampling? | Sampling that is convenient. |

What is a permutation? the formula? | Order matters: nPr=n!/(n-r)! |

What is a combination? the formula? | Order doesn't matter; nCr=n!/r!(n-r)! |

What is an example of a factorial? | 8!= 8*7*6*5*4*3*2*1 ; 4!= 4*3*2*1 |

What are mutually exclusive events? | Denoting two events that cannot occur at the same time. |

What are overlapping events? | Events that occur at the same time. |

What is the addition rule? | P(A or B)=P(A)+ P(B)- P(A intersection B) |

What is conditional probability? | P(B/A)=P(A and B)/P(A) |

What is an independent event? | P(A and B)=P(A)+P(B) |

What are dependent events? | P(A and B)=P(A)+P(B after A) |

Proving independent events. |

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nriggs626